First timer running the numbers

[Justin Trudell]

I'm a first time investor running the numbers on a triplex in central MA. 200k purchase price, 20% down payment and 5% mortgage. 3 units all rented at 1000 per month with assumed vacancy rate of 25%. Turnkey property, so assuming 5k in improvements, 4k in closing costs. Annual numbers assumed (3k taxes, 4k maintenance, 1k insurance, 3k for PM/admin fees). Total money down assumed to be just shy of 50k. My calculator is showing annual pre-tax cash flow at $5,643 which equates to an ROI of ~16% pre-tax. What am I missing here?